EP3555431A1 - Coanda effect moisture separator system - Google Patents

Coanda effect moisture separator system

Info

Publication number
EP3555431A1
EP3555431A1 EP17808887.8A EP17808887A EP3555431A1 EP 3555431 A1 EP3555431 A1 EP 3555431A1 EP 17808887 A EP17808887 A EP 17808887A EP 3555431 A1 EP3555431 A1 EP 3555431A1
Authority
EP
European Patent Office
Prior art keywords
separator
pathway
steam
flow
moisture
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP17808887.8A
Other languages
German (de)
French (fr)
Other versions
EP3555431B1 (en
Inventor
Loris Padovan
Praveen Kumar Garlapati
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GE Vernova GmbH
Original Assignee
General Electric Technology GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Electric Technology GmbH filed Critical General Electric Technology GmbH
Publication of EP3555431A1 publication Critical patent/EP3555431A1/en
Application granted granted Critical
Publication of EP3555431B1 publication Critical patent/EP3555431B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/04—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia
    • B01D45/08—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by impingement against baffle separators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
    • B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
    • F01K7/22—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating
    • F01K7/223—Inter-stage moisture separation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/26—Steam-separating arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/26—Steam-separating arrangements
    • F22B37/28—Steam-separating arrangements involving reversal of direction of flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/26—Steam-separating arrangements
    • F22B37/30—Steam-separating arrangements using impingement against baffle separators

Definitions

  • the present application and the resultant patent relate generally to turbomachinery and more particularly relate to a pre-separator for a moisture separator reheater using a Coanda effect moisture separator system to remove liquid droplets from a gas or a stream path.
  • Nuclear power plants often include a moisture separator reheater to dry and reheat the steam supply.
  • the moisture separator reheater may dry and reheat the flow of steam exhausted from a steam turbine system that drives, for example, an electrical generator and the like.
  • the moisture separator reheater may dry and reheat the steam exhausted from a high pressure steam turbine and then deliver the dry reheated steam to a low pressure steam turbine.
  • physically removing the liquid droplets provides an overall increase in system efficiency.
  • physically removing the liquid droplets may protect downstream equipment from damage due to erosion and the like.
  • the present application and the resultant patent thus provide a pre- separator for use with a flow of steam entering a moisture separator reheater.
  • the pre- separator may include a neck, an internal baffle, a wall, a first pathway defined between the neck and the internal baffie, and a second pathway defined between the internal baffle and the wall.
  • the first pathway and the second pathway create a Coanda effect for the flow of steam entering the moisture separator reheater for increased moisture removal efficiency.
  • the present application and the resultant patent further provide a method of removing moisture in a flow of steam entering a moisture separator reheater.
  • the method may include the steps of flowing the steam into a pre-separator, splitting the flow of steam into a number of pathways, wherein the number of pathways include a substantially curved shape, turning the number of flows of steam approximately ninety degrees, creating a Coanda effect while turning the flows of steam, and substantially attaching the flows of steam to a bottom wall of the moisture separator reheater for increased moisture removal efficiency.
  • the present application and the resultant patent further provide a moisture separator reheater for removing moisture droplets from a flow of steam.
  • the moisture separator reheater may include a bottom wall and a pre-separator positioned about the bottom wall.
  • the pre-separator may include a first pathway and a second pathway with a substantially curved shape so as to induce a Coanda effect in the flow of steam such that the Coanda effect substantially attaches the flow of steam to the bottom wall for increased moisture removal efficiency.
  • FIG. 1 is a partial perspective view of a pre-separator used with a moisture separator reheater.
  • Fig. 2 is a partial sectional view of the pre-separator of Fig. 1.
  • FIG. 3 is a perspective view of a pre-separator as may be described herein for use with a moisture separator reheater.
  • Fig. 4 is a top plan view of the pre-separator of Fig. 3.
  • Fig. 5 is a partial sectional view of the pre-separator of Fig. 3.
  • Fig. 6 is a partial sectional view of the pre-separator of Fig. 3 used with a moisture separator reheater.
  • Figs. 1 and 2 show portions of a pre-separator 10 that may be used with a moisture separator reheater 15 and the like.
  • a flow of wet steam 20 coming from, for example, a high pressure steam turbine may be introduced into the moisture separator reheater 15 via the pre-separator 10.
  • the flow of steam 20 with moisture droplets 25 therein may enter the pre-separator 10 in a first direction and then may be forced to turn approximately ninety degrees (90°) or so into a largely perpendicular second direction.
  • the moisture droplets 25 may not able to follow this change of direction and thus may deviate from the flow of steam 20 and impact on the walls/ceilings 30 of the pre-separator 10.
  • the moisture droplets 25 may adhere and coalesce along the walls/ceiling 30 and may be captured by a water collector 35 positioned about the circumference of the pre-separator 10.
  • the water collector 35 may be a mechanical device positioned about the pre- separator 10.
  • the moisture droplets 25 then may be drained out of the pre-separator 10 via one or more drains.
  • the sharp ninety degree (90°) turn may generate a flow separation about a neck 40 of the pre-separator 10. Such a flow separation may create a steam maldistribution in the moisture separator reheater 15. The maldistribution may have an impact on overall moisture removal and reheating efficiency.
  • the moisture separator reheater 15 and the pre-separator 10 described herein are for the purpose of example only. Many other types of moisture separator reheaters 15, pre-separators 10, and components thereof may be known.
  • Figs. 3-5 show a pre-separator 100 as may be described herein.
  • the pre- separator 100 may be used with a moisture separator reheater 15 and the like.
  • the pre-separator 100 described herein may have a first pathway 110 and a second pathway 120.
  • the first pathway 1 10 may extend from a neck 130 to an internal baffle 140.
  • the internal baffle 140 may have a substantially curved shape 150.
  • the second pathway 120 may extend from the internal baffle 140 to a wall/ceiling 160.
  • the wall/ceiling 160 also may have the substantially curved shape 150.
  • the neck 130, the internal baffle 140, and the wall/ceiling 160 may have any suitable size, shape, or configuration. Although only two pathways are shown the pre-separator 100 may use any number herein. Other components and other configurations may be used herein.
  • the pre-separator 100 may enable a Coanda effect therethrough.
  • the Coanda effect uses the tendency of a fluid jet to attach itself to, and flow along, a wall or another surface.
  • the convex curvature of the pathways 1 10, 120 deflects the flow such that the flow may attach to a bottom wall 45 of the moisture separator reheater 15 more rapidly and also may be accelerated more rapidly.
  • the Coanda effect largely may avoid the flow separation described above about the neck 40.
  • the substantially curved shape 150 of the pathways 110, 120 induces the flow of steam 20 with the moisture droplet 25 therein to remain attached to the bottom wall 45 of the moisture separator reheater 15.
  • the flow also slows down because the flow is being distributed in a larger area.
  • This process helps the agglomeration and coalescence of the moisture droplets 25.
  • the moisture droplets consequently become bigger and heavier and, hence, easier to capture via gravity.
  • the moisture droplets 25 thus may be directed towards the bottom wall 45 so as to form a water film.
  • One or more drains 170 may be positioned about the bottom wall 45 to drain the water film or otherwise drain the moisture therein.
  • the resultant flow of steam 20 thus may be significantly drier with the moisture droplets 25 removed.
  • Other components and other configurations may be used herein.
  • the pre-separator 100 thus promotes a more uniform steam flow distribution 20 therethrough so as to avoid local high residual moisture concentrations upstream of another separator device placed after the pre-separator and higher thermal stresses on the bundles. Moreover, the use of the pre-separator 100 avoids the use of the complex water collectors 35 as described above.
  • the pre-separator 100 may be lighter, more compact, and easy to manufacture. The pre-separator 100 may reduce considerably the pressure loss.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Separating Particles In Gases By Inertia (AREA)

Abstract

The present application provides a pre-separator (10) for use with a flow of steam entering a moisture separator reheater. The pre-separator includes a neck (40), an internal baffle (140), a wall (160), a first pathway (110) defined between the neck and the internal baffle (140), and a second pathway (120) defined between the internal baffle (140) and the wall (160). The first pathway and the second pathway create a Coanda effect for the flow of steam entering the moisture separator reheater, wherein the Coanda effect leads to the flow of steam following convex surfaces of the pre-separator.

Description

COANDA EFFECT MOISTURE SEPARATOR SYSTEM
TECHNICAL FIELD
[0101] The present application and the resultant patent relate generally to turbomachinery and more particularly relate to a pre-separator for a moisture separator reheater using a Coanda effect moisture separator system to remove liquid droplets from a gas or a stream path.
BACKGROUND OF THE INVENTION
[0102] Nuclear power plants often include a moisture separator reheater to dry and reheat the steam supply. The moisture separator reheater may dry and reheat the flow of steam exhausted from a steam turbine system that drives, for example, an electrical generator and the like. Specifically, the moisture separator reheater may dry and reheat the steam exhausted from a high pressure steam turbine and then deliver the dry reheated steam to a low pressure steam turbine. As compared to the energy required to evaporate the liquid droplets in the flow of steam, physically removing the liquid droplets provides an overall increase in system efficiency. Moreover, physically removing the liquid droplets may protect downstream equipment from damage due to erosion and the like. SUMMARY OF THE INVENTION
[0103] The present application and the resultant patent thus provide a pre- separator for use with a flow of steam entering a moisture separator reheater. The pre- separator may include a neck, an internal baffle, a wall, a first pathway defined between the neck and the internal baffie, and a second pathway defined between the internal baffle and the wall. The first pathway and the second pathway create a Coanda effect for the flow of steam entering the moisture separator reheater for increased moisture removal efficiency.
[0104] The present application and the resultant patent further provide a method of removing moisture in a flow of steam entering a moisture separator reheater. The method may include the steps of flowing the steam into a pre-separator, splitting the flow of steam into a number of pathways, wherein the number of pathways include a substantially curved shape, turning the number of flows of steam approximately ninety degrees, creating a Coanda effect while turning the flows of steam, and substantially attaching the flows of steam to a bottom wall of the moisture separator reheater for increased moisture removal efficiency..
[0105] The present application and the resultant patent further provide a moisture separator reheater for removing moisture droplets from a flow of steam. The moisture separator reheater may include a bottom wall and a pre-separator positioned about the bottom wall. The pre-separator may include a first pathway and a second pathway with a substantially curved shape so as to induce a Coanda effect in the flow of steam such that the Coanda effect substantially attaches the flow of steam to the bottom wall for increased moisture removal efficiency..
[0106] These and other features and improvements of the present application and the resultant patent will become apparent to one of ordinary skill in the art upon review of the following detailed description when taken in conjunction with the several drawings and the appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS
[0107] Fig. 1 is a partial perspective view of a pre-separator used with a moisture separator reheater.
[0108] Fig. 2 is a partial sectional view of the pre-separator of Fig. 1.
[0109] Fig. 3 is a perspective view of a pre-separator as may be described herein for use with a moisture separator reheater.
[0110] Fig. 4 is a top plan view of the pre-separator of Fig. 3.
[0111] Fig. 5 is a partial sectional view of the pre-separator of Fig. 3.
[0112] Fig. 6 is a partial sectional view of the pre-separator of Fig. 3 used with a moisture separator reheater.
DETAILED DESCRIPTION
[0113] Figs. 1 and 2 show portions of a pre-separator 10 that may be used with a moisture separator reheater 15 and the like. Generally described, a flow of wet steam 20 coming from, for example, a high pressure steam turbine, may be introduced into the moisture separator reheater 15 via the pre-separator 10. The flow of steam 20 with moisture droplets 25 therein may enter the pre-separator 10 in a first direction and then may be forced to turn approximately ninety degrees (90°) or so into a largely perpendicular second direction. Due to the inertia of the moisture droplets 25, the moisture droplets 25 may not able to follow this change of direction and thus may deviate from the flow of steam 20 and impact on the walls/ceilings 30 of the pre-separator 10. The moisture droplets 25 may adhere and coalesce along the walls/ceiling 30 and may be captured by a water collector 35 positioned about the circumference of the pre-separator 10. The water collector 35 may be a mechanical device positioned about the pre- separator 10. The moisture droplets 25 then may be drained out of the pre-separator 10 via one or more drains.
[0114] The sharp ninety degree (90°) turn may generate a flow separation about a neck 40 of the pre-separator 10. Such a flow separation may create a steam maldistribution in the moisture separator reheater 15. The maldistribution may have an impact on overall moisture removal and reheating efficiency. The moisture separator reheater 15 and the pre-separator 10 described herein are for the purpose of example only. Many other types of moisture separator reheaters 15, pre-separators 10, and components thereof may be known.
[0115] Figs. 3-5 show a pre-separator 100 as may be described herein. The pre- separator 100 may be used with a moisture separator reheater 15 and the like. Instead of a single pathway extended through the pre-separator 10 as described above between the walls/ceiling 30 and the neck 40, the pre-separator 100 described herein may have a first pathway 110 and a second pathway 120. The first pathway 1 10 may extend from a neck 130 to an internal baffle 140. The internal baffle 140 may have a substantially curved shape 150. The second pathway 120 may extend from the internal baffle 140 to a wall/ceiling 160. The wall/ceiling 160 also may have the substantially curved shape 150. The neck 130, the internal baffle 140, and the wall/ceiling 160 may have any suitable size, shape, or configuration. Although only two pathways are shown the pre-separator 100 may use any number herein. Other components and other configurations may be used herein.
[0116] By splitting the steam path into the first pathway 1 10 and the second pathway 120, the pre-separator 100 may enable a Coanda effect therethrough. Specifically, the Coanda effect uses the tendency of a fluid jet to attach itself to, and flow along, a wall or another surface. As is shown in Fig. 6, the convex curvature of the pathways 1 10, 120 deflects the flow such that the flow may attach to a bottom wall 45 of the moisture separator reheater 15 more rapidly and also may be accelerated more rapidly. The Coanda effect largely may avoid the flow separation described above about the neck 40. Rather, the substantially curved shape 150 of the pathways 110, 120 induces the flow of steam 20 with the moisture droplet 25 therein to remain attached to the bottom wall 45 of the moisture separator reheater 15. The flow also slows down because the flow is being distributed in a larger area. This process helps the agglomeration and coalescence of the moisture droplets 25. The moisture droplets consequently become bigger and heavier and, hence, easier to capture via gravity. The moisture droplets 25 thus may be directed towards the bottom wall 45 so as to form a water film. One or more drains 170 may be positioned about the bottom wall 45 to drain the water film or otherwise drain the moisture therein. The resultant flow of steam 20 thus may be significantly drier with the moisture droplets 25 removed. Other components and other configurations may be used herein.
[0117] The pre-separator 100 thus promotes a more uniform steam flow distribution 20 therethrough so as to avoid local high residual moisture concentrations upstream of another separator device placed after the pre-separator and higher thermal stresses on the bundles. Moreover, the use of the pre-separator 100 avoids the use of the complex water collectors 35 as described above. The pre-separator 100 may be lighter, more compact, and easy to manufacture. The pre-separator 100 may reduce considerably the pressure loss.
[0118] It should be apparent that the foregoing relates only to certain embodiments of the present application and the resultant patent. Numerous changes and modifications may be made herein by one of skill in the art without departing from the spirit and general scope of the invention as defined by the following claims and the equivalents thereof.

Claims

CLAIMS We claim:
1. A pre-separator for use with a flow of steam entering a moisture separator reheater, comprising:
a neck;
an internal baffle;
a wall;
a first pathway defined between the neck and the internal baffle; and
a second pathway defined between the internal baffle and the wall;
wherein the first pathway and the second pathway create a Coanda effect for the flow of steam entering the moisture separator reheater.
2. The pre-separator of claim 1 , wherein the first pathway comprises a substantially curved shape.
3. The pre-separator of claim 2, wherein the second pathway comprises the substantially curved shape.
4. The pre-separator of claim 1 , wherein the pre-separator is positioned about a bottom wall of the moisture separator reheater and wherein the Coanda effect substantially attaches the flow of steam to the bottom wall.
5. The pre-separator of claim 4, wherein the bottom wall comprises one or more drains therein.
6. The pre-separator of claim 1 , wherein the Coanda effect produced by the first pathway and the second pathway promotes a uniform distribution of the flow of steam.
7. The pre-separator of claim 1 , wherein the Coanda effect produced by the first pathway and the second pathway promotes coalescence of moisture droplets in the flow of steam.
8. The pre-separator of claim 1 , wherein the Coanda effect produced by the first pathway and the second pathway avoids a flow separation of the flow of steam about the neck.
9. The pre-separator of claim 1 , wherein the Coanda effect produced by the first pathway and the second pathway slows the flow of steam.
10. A method of removing moisture in a flow of steam entering a moisture separator reheater, comprising:
flowing the steam into a pre-separator;
splitting the flow of steam into a plurality of pathways;
wherein the plurality of pathways comprise a substantially curved shape;
turning the plurality of flows of steam approximately ninety degrees;
creating a Coanda effect while turning the plurality of flows of steam; and substantially attaching the plurality of flows of steam to a bottom wall of the moisture separator reheater.
1 1. The method of claim 10, wherein the step of splitting the flow of steam into a plurality of pathways comprises splitting the flow of steam into a first pathway defined between a neck and an internal baffle of the pre-separator.
12. The method of claim 1 1 , wherein the step of splitting the flow of steam into a plurality of pathways comprises splitting the flow of steam into a second pathway defined between the internal baffle and a wall of the pre-separator.
13. The method of claim 10, wherein the step of creating a Coanda effect comprises coalescing moisture droplets in the flow of steam.
14. The method of claim 13, further comprising the step of draining the moisture droplets in a drain in the bottom wall of the moisture separator reheater.
15. The method of claim 10, wherein the step of creating a Coanda effect comprises promoting a uniform distribution of the flow of steam.
16. A moisture separator reheater for removing moisture droplets from a flow of steam, comprising:
a bottom wall; and
a pre-separator positioned about the bottom wall;
the pre-separator comprising a first pathway and a second pathway;
wherein the first pathway and the second pathway comprise a substantially curved shape so as to induce a Coanda effect in the flow of steam such that the Coanda effect substantially attaches the flow of steam to the bottom wall.
17. The moisture separator reheater of claim 16, wherein the first pathway is defined between a neck and an internal baffle of the pre-separator.
18. The moisture separator reheater of claim 17, wherein the second pathway is defined between the internal baffle and a wall of the pre-separator.
19. The moisture separator reheater of claim 16, wherein the bottom wall comprises a drain therein.
20. The moisture separator reheater of claim 16, wherein the Coanda effect produced by the first pathway and the second pathway promotes coalescence of the moisture droplets in the flow of steam.
EP17808887.8A 2016-12-16 2017-12-01 Moisture separator reheater Active EP3555431B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15/382,146 US11291938B2 (en) 2016-12-16 2016-12-16 Coanda effect moisture separator system
PCT/EP2017/081256 WO2018108589A1 (en) 2016-12-16 2017-12-01 Coanda effect moisture separator system

Publications (2)

Publication Number Publication Date
EP3555431A1 true EP3555431A1 (en) 2019-10-23
EP3555431B1 EP3555431B1 (en) 2023-08-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP17808887.8A Active EP3555431B1 (en) 2016-12-16 2017-12-01 Moisture separator reheater

Country Status (7)

Country Link
US (1) US11291938B2 (en)
EP (1) EP3555431B1 (en)
JP (1) JP7341887B2 (en)
KR (1) KR102433379B1 (en)
CN (1) CN110050108B (en)
PL (1) PL3555431T3 (en)
WO (1) WO2018108589A1 (en)

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US20200070079A1 (en) * 2018-08-31 2020-03-05 Jeong Hwa SON Filtration System

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Also Published As

Publication number Publication date
KR102433379B1 (en) 2022-08-17
JP7341887B2 (en) 2023-09-11
JP2020512928A (en) 2020-04-30
US11291938B2 (en) 2022-04-05
US20180169554A1 (en) 2018-06-21
KR20190097014A (en) 2019-08-20
CN110050108A (en) 2019-07-23
WO2018108589A1 (en) 2018-06-21
CN110050108B (en) 2022-03-29
PL3555431T3 (en) 2023-10-09
EP3555431B1 (en) 2023-08-02

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